roper and w



UNITED STATES PATENT OFFICE.

E. H. ROPER AND W. BALL, OF WASHINGTON, DISTRICT OF COLUMBIA. i

PADLOCK.

To all whom t may concern.'

Be it known that we, E. H. ROPER and IILLIAM BALL, of Vashington city,District of Columbia, have invented a new and Improved Mode ofConstructing Padlocks, and we dol hereby declare that the following is afull, clear, and exact description of the construction and operation ofthe same, reference being had to the annexed drawings, making a part ofthis specification, in which- Figure l is a view of the outer part ofthe lock when open or unlocked, that is of the top plate. Fig. 2 is aView of the lock, wit-hout the to-p plate, and is locked. Fig. 3 is aview of the same, with the catches Open cr unlocked. Fig. l is the uppercatch or tumbler; Fig. 5, the second tumbler; Fig. 6, the thirdltumbler, and Fig. 7, the bottom or 'ourth tumbler. Fig. S is the key.

To enable others skilled in the arttov make and -use our invention, wewill proceed to describe its construction and operatiOn.

Vile make our case of cast or wrought iron, or brass or any metal, andthe tumblers all turn on the pin a in Fig. 2, having a spring b as shownin a bowed form in Fig. 6. The opening for the spring b is cut in such aform as no-t to allow the spring to touch but one of the tumblers ateach end; consequently when the tumblers are turned so as to open thecatches and free the head ofV the shackle, Fig. 3, the ends of thespring presses the tumblers in contrary directions around the pin a,Fig. 2.

Another form of spring is shown, in letter (l, Fig. 3, whichacts thesame as the rst, but is placed with the ends near the center of thetumblers and consequently requires less motion. Y

What we claim as our invention and desire to secure by Letters Patent,is

The construction of our tumblers in such a form as to be on'a balance onall sides of the pin, letter, a in Fig. 2, and in their having rotarymotions in differentdirections,V

which prevents them from being affected by a blow to open the lock andfurther in their being .so constructed as to pass each other where thekey enters and thereby cut off all possibility of picks being used toopen

